Looks like a bug in LWJGL, not X. Others have seen the same error on earlier
versions of Ubuntu.
http://www.wurmonline.com/forum/index.php?action=printpage%3Btopic=9043.0
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: Incomplete => Invalid
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Java can't open X window anymore
https://bugs.launchpad.net/bugs/354340
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